JP2017160880A - Exhaust pipe shut-off valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust pipe shut-off valve device smoothly operable even under a high-temperature and corrosive environment.SOLUTION: An exhaust shut-off valve device 1 comprises a valve housing 2 which is provided in the middle of an exhaust pipe 10 and is formed with an inner peripheral hole 2a forming a part of the exhaust pipe 10, a valve 3 supported to open and close the inner peripheral hole 2a of the valve housing 2, and an actuator 5 rotating the valve 3. The valve housing 2 is formed in the inner peripheral hole 2a with a rotating shaft hole 2b supporting the valve 3, and a bushing 61 is inserted in the rotating shaft hole 2b. The valve 3 has a rotating shaft member 32 rotatably supported in the rotating shaft hole 2b via the bushing 61, and a valve element 31 which is fixed to the rotating shaft member 32, opens and closes the inner peripheral hole 2a. The bushing 61 is an expanded-graphite braided gland packing.SELECTED DRAWING: Figure 4

Description

The present invention relates to the technical field of an exhaust pipe on-off valve device that adjusts exhaust gas pressure by changing the angle of a valve provided in a passage in the middle of an exhaust pipe.

  Conventionally, in an exhaust pipe opening / closing valve device provided in the middle of an exhaust pipe of a vehicle, the inner peripheral hole of the valve housing constituting a part of the exhaust pipe is plated, and the valve body is fixed and the rotation supported by the valve housing The shaft is subjected to a corrosion-resistant gas softening treatment (see Patent Document 1).

Japanese Patent Laid-Open No. 2003-13752

  FIG. 6 shows a state in which the bush 161 of the conventional exhaust pipe on-off valve device and the rotary shaft member 132 are in line contact. FIG. 7 shows a state where the bush 161 of the conventional exhaust pipe on-off valve device and the rotary shaft member 132 are in point contact.

  In general, exhaust pipe opening / closing valve devices such as an exhaust brake and a DPF valve are used in a high-temperature environment (500 ° C. or higher), so that thermal expansion at a high temperature is taken into consideration between the bush 161 and the rotary shaft member 132. Clearance was provided. However, by providing the clearance, the bush 161 and the rotary shaft member 132 are in line contact or point contact as shown in FIG. 6 or FIG. And the surface pressure of the contact part of the bush 161 and the rotating shaft member 132 became high, and the amount of deflection | deviation was also large. Therefore, the coefficient of friction due to adhesion wear is large, and there is a risk that the rotational resistance increases and a return failure occurs.

  The present invention has been made in view of such circumstances, and provides an exhaust pipe on-off valve device that can operate smoothly even in a high temperature and corrosive environment.

In order to solve the above-described problem, an exhaust pipe opening / closing valve device according to an embodiment of the present invention includes:
A valve housing provided in the middle of the exhaust pipe and having an inner peripheral hole forming a part of the exhaust pipe;
A valve supported so as to be able to open and close the inner peripheral hole of the valve housing;
An actuator for rotating the valve;
With
The valve housing is
A rotation shaft hole for supporting the valve is formed in the inner peripheral hole,
A bush is inserted into the rotation shaft hole,
The valve is
A rotating shaft member rotatably supported by the rotating shaft hole via the bush;
A valve body fixed to the rotating shaft member to open and close the inner peripheral hole;
Have
The bush is an expanded graphite braided gland packing.

In the exhaust pipe on-off valve device according to one embodiment of the present invention,
The bush and the rotary shaft member are in surface contact.

In the exhaust pipe on-off valve device according to one embodiment of the present invention,
A stopper for restricting rotation of the rotary shaft member;
The actuator is
A drive unit including a cylinder, a piston that moves in the cylinder, and a piston rod that supports the piston;
A transmission unit including a link-shaped lever that transmits the driving force of the driving unit to the rotary shaft member;
Have
The stopper restricts rotation of the rotating shaft member by contacting the lever on an axis of the cylinder.

In the exhaust pipe on-off valve device according to one embodiment of the present invention,
The actuator is
A drive unit including a cylinder, a piston that moves in the cylinder, a piston rod that supports the piston, and an end plate that covers one end of the cylinder;
The exhaust pipe on-off valve device according to any one of claims 1 to 3, wherein the end plate regulates rotation of the rotary shaft member by contacting the piston on an axis of the cylinder. .

In the exhaust pipe on-off valve device according to one embodiment of the present invention,
It has an urging member which urges the lever in the direction of the rotation axis.

In the exhaust pipe on-off valve device according to one embodiment of the present invention,
A pressing member is provided between the bush and the lever,
A labyrinth ring is installed inside the pressing member and around the rotating shaft member.

According to the exhaust pipe on-off valve device according to one embodiment of the present invention,
A valve housing provided in the middle of the exhaust pipe and having an inner peripheral hole forming a part of the exhaust pipe;
A valve supported so as to be able to open and close the inner peripheral hole of the valve housing;
An actuator for rotating the valve;
With
The valve housing is
A rotation shaft hole for supporting the valve is formed in the inner peripheral hole,
A bush is inserted into the rotation shaft hole,
The valve is
A rotating shaft member rotatably supported by the rotating shaft hole via the bush;
A valve body fixed to the rotating shaft member to open and close the inner peripheral hole;
Have
Since the bush is an expanded graphite braided gland packing,
It is possible to operate smoothly even under high temperature and corrosive environment.

Moreover, according to the exhaust pipe on-off valve device according to one embodiment of the present invention,
Since the bush and the rotating shaft member are in surface contact,
Adhesive wear can be prevented, return failure can be prevented, and operation can be performed more smoothly.

Moreover, according to the exhaust pipe on-off valve device according to one embodiment of the present invention,
A stopper for restricting rotation of the rotary shaft member;
The actuator is
A drive unit including a cylinder, a piston that moves in the cylinder, and a piston rod that supports the piston;
A transmission unit including a link-shaped lever that transmits the driving force of the driving unit to the rotary shaft member;
Have
Since the stopper regulates the rotation of the rotary shaft member by contacting the lever on the cylinder axis,
The impact load of the stopper transmitted to the bush can be made substantially zero, and the bush receives only the external force of the exhaust pressure and the vibration load, and the durability can be improved.

Moreover, according to the exhaust pipe on-off valve device according to one embodiment of the present invention,
The actuator is
A drive unit including a cylinder, a piston that moves in the cylinder, a piston rod that supports the piston, and an end plate that covers one end of the cylinder;
Since the end plate regulates the rotation of the rotating shaft member by contacting the piston on the axis of the cylinder,
The impact load of the end plate transmitted to the bush can be made almost zero, and the bush receives only the external force of the exhaust pressure and the vibration load, so that the durability can be improved.

Moreover, according to the exhaust pipe on-off valve device according to one embodiment of the present invention,
Since it has a biasing member that biases the lever in the direction of the rotation axis,
It is possible to apply a load to the lever and remove the play of the transmission part, and it is possible to prevent wear due to fretting during vibration of the bush.

Moreover, according to the exhaust pipe on-off valve device according to one embodiment of the present invention,
A pressing member is provided between the bush and the lever,
Since a labyrinth ring is installed inside the pressing member and around the rotating shaft member,
Even if the bush is unevenly worn, shaft leakage can be prevented.

The front view of the exhaust pipe on-off valve apparatus of this embodiment is shown. The side view of the exhaust pipe on-off valve apparatus of this embodiment is shown. The valve | bulb of the exhaust pipe on-off valve apparatus of this embodiment is shown. The enlarged view of the valve periphery of FIG. 1 is shown. The labyrinth ring of the exhaust pipe on-off valve apparatus of this embodiment is shown. The bush and rotary shaft member of the conventional exhaust pipe on-off valve device are in a line contact state. The bush and rotary shaft member of the conventional exhaust pipe on-off valve device show a point contact state.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a front view of an exhaust pipe on-off valve device 1 of the present embodiment. FIG. 2 shows a side view of the exhaust pipe opening / closing valve device 1 of the present embodiment. FIG. 3 shows the valve 3 of the exhaust pipe opening / closing valve device 1 of the present embodiment. FIG. 4 shows an enlarged view around the valve of FIG. FIG. 5 shows the labyrinth ring 65 of the exhaust pipe opening / closing valve device 1 of the present embodiment.

  The exhaust pipe on-off valve device 1 of this embodiment includes a valve housing 2 provided in the middle of an exhaust pipe (not shown), a valve 3 rotatably supported by the valve housing 2, a bracket 4 that supports the valve housing 2, And an actuator 5 supported by the bracket 4 and driving the valve 3.

  The valve housing 2 is formed with an inner peripheral hole 2a that is connected to the exhaust pipe and forms a part of the exhaust pipe. Two rotation shaft holes 2b are formed in the inner peripheral hole 2a at positions facing the inner peripheral hole shaft 2c. The material of the valve housing 2 is preferably spheroidal graphite cast iron (FCD450) or stainless cast steel (SCS13).

  The valve 3 includes a butterfly-type valve body 31 that opens and closes the inner peripheral hole 21, and a rotary shaft member 32 that is fixed to the valve body 31 with a bolt or the like. The rotating shaft member 32 is rotatably supported by the valve housing 2 via a bush 61 inserted into the rotating shaft hole 2b. The material of the rotating shaft member 32 is preferably stainless steel (SUS303) or the like.

  The bracket 4 supports the valve housing 2 and the actuator 5 with bolts or the like. The bracket 4 includes a first bracket 41 that supports the actuator 5 side of the valve housing 2, and a second bracket 42 that supports the valve housing 2 on the opposite side of the first bracket 41 with respect to the inner peripheral hole shaft 2c. . The first bracket 41 is formed with a through hole 4a through which the rotary shaft member 32 is rotatable. By supporting the valve housing 2 and the actuator 5 on the bracket 4, the exhaust pipe on-off valve device 1 is configured as one unit.

  A stopper 43 is attached to the lower end of the first bracket 41. The stopper 43 restricts rotation of a lever 523 described later. That is, when the lever 523 comes into contact with the stopper 43, the rotation of the lever 523 is restricted, and as a result, the rotation of the valve body 31 is restricted.

  In the present embodiment, the stopper 43 is constituted by a bolt. The contact position between the stopper 43 and the lever 523 is adjusted by adjusting the height at which the bolt is tightened against the nut. As a result, the rotation angle of the valve body 31 is adjusted.

  The actuator 5 is supported by the bracket 4 and opens and closes the valve 3 with respect to the inner peripheral hole 2 a of the valve housing 2. As will be described later, the actuator 5 of the present embodiment slides the piston 512 against the biasing force of the compression spring 514 by the compressed air supplied into the cylinder 511 from the supply port 511a and moves the piston rod 513. And a link-shaped transmission unit 52 that transmits the driving force of the driving unit 51 to the rotary shaft member 32.

  The drive unit 51 includes a cylinder 511, a piston 512 that moves in the cylinder 511, a piston rod 513 that supports the piston 512, a compression spring 514 that biases the piston 512 to the side opposite to the transmission unit 52, and one end of the cylinder 511. And an end plate 515 that covers the lid. The transmission unit 52 includes a joint 521 that is rotatably connected to the piston rod 513, a clevis 522 that is rotatably connected to the joint 521, and one that is rotatably connected to the clevis 522 and the other is A lever 523 connected to the rotary shaft member 32 is provided.

  When the driving unit 51 of the actuator 5 is operated, the driving force is transmitted to the rotating shaft member 32 via the transmitting unit 52, the rotating shaft member 32 rotates, and the valve body 31 rotates. Specifically, when the piston 512, the piston rod 513, the joint 521, and the clevis 522 move and rotate the lever 523, the rotating shaft member 32 rotates and the valve body 31 rotates.

  A bush 61 is inserted into the rotation shaft hole 2b. Spacers 62 are installed on both sides of the bush 61 in the rotation axis direction. A pressing member 64 covered with a cover 63 is installed between the rotary shaft member 32 and the through hole 4a formed in the first bracket. A ring spring-shaped labyrinth ring 65 is installed inside the pressing member 64. Around the cover 63, a torsion coil spring 66 is attached as an urging member that is urged so as to press the lever 523 of the transmission portion 52 in the rotation axis direction.

  By installing the labyrinth ring 65 inside the pressing member 64, shaft leakage can be prevented even if the bush 61 is partially worn. Further, by attaching the torsion coil spring 66 biased so as to press the lever 523 around the cover 63, it is possible to apply a load to the lever 523 and remove the play of the transmission portion 52. As a result, it is possible to prevent wear due to fretting during vibration of the bush 61.

  In the exhaust pipe opening / closing valve device 1 of the present embodiment, an expanded graphite braided gland packing is used as the bush 61. The expanded graphite braided gland packing is a knitted fabric made of expanded graphite and carbon fiber without using a lubricant, an adhesive, or an impregnating agent as much as possible. The expanded graphite braided gland packing can ensure an oxidation atmosphere heat resistance temperature of 650 ° C. or higher. Therefore, even when used in a diesel particulate filter (DPF), it is possible to have corrosion resistance against corrosion caused by the condensed water of PH 3.3 discharged. Further, when the knitted fabric is reinforced with a material equivalent to Inconel 600, it can be used even in a steam atmosphere, and the allowable surface pressure is improved.

  Preferably, the spacer 62 is made of aluminum bronze (C6191), the pressing member 64 is made of stainless steel (SUS303), and the labyrinth ring 65 is made of stainless steel (SUS316). The labyrinth ring 65 has a hole labyrinth ring 65a and a shaft labyrinth ring 65b. The inner diameter of the shaft labyrinth ring 65b is smaller than the shaft diameter of the rotary shaft member 32, and the outer diameter of the hole labyrinth ring 65a is larger than the stepped hole diameter of the pressing member 64, which is a spring effect acting in each radial direction. It is possible to prevent shaft leakage by minimizing each clearance.

  Here, a method of assembling the bush 61 to the valve housing 2 will be described. The bush 61 is inserted into the rotation shaft hole 2 b when the rotation shaft member 32 is temporarily assembled to the valve housing 2. The inserted bush 61 is pressed with a jig by 8 to 10 tons to form a molded ring. The bush 61 formed into a molded ring is tightened by a pressing member 64 with a load of 2 to 3 tons. As a result, the thermal expansion and misalignment are absorbed using the restoring action from the compression of the bush 61. At this time, the bush 61 and the rotating shaft member 32 are in an interference fit state. Thereafter, the exhaust pipe opening / closing valve device 1 is assembled, and the running-in operation is performed 0.5 to 10,000 times for 4 to 8 hours, thereby eliminating the clearance and bringing the bush 61 and the rotary shaft member 32 into surface contact.

  By bringing the bush 61 and the rotary shaft member 32 into surface contact, the allowable surface pressure of the bush 61 is 35 MPa or less, and when using a material equivalent to Inconel 600 as the material, 41 MPa or less is used to prevent adhesive wear, and the coefficient of friction is 0. It can be made 6 or less, and it becomes possible to prevent a return failure. Moreover, it becomes possible to abolish the surface hardening process of the rotating shaft member 32. Further, it is not necessary to perform heat treatment, and alignment can be improved.

  The actuator 5 of this embodiment uses an air cylinder. The air cylinder is driven with compressed air by switching the solenoid valve ON / OFF. In the conventional exhaust pipe opening / closing valve device, an impact force is generated when the electromagnetic valve is switched between ON (going) and OFF (returning). In contrast, when the exhaust pipe opening / closing valve device 1 according to the present embodiment is operated from fully open to fully closed, the stopper 43 contacts the lever 523 on the axis 51c of the cylinder 511, thereby rotating the rotary shaft member 32. It is preferable to set so as to be regulated. Further, it is preferable that the piston 512 and the end plate 515 are brought into contact with each other in the fully opened position. By setting in this way, the impact load of the stopper 43 transmitted to the bush 61 and the impact load of the end plate 515 when returning from the fully closed state to the fully open state can be made substantially zero. Only the external force is received, and durability can be improved.

  In this embodiment, it arrange | positions so that the axis line 43c of the volt | bolt as the stopper 43 and the axis line 51C of the cylinder 511 may overlap. By overlapping the axis 43c of the bolt and the axis 51C of the cylinder 511, the impact load of the stopper 43 transmitted to the bush 61 can be made almost zero. As a result, the bush 61 receives only the external force of the exhaust pressure and the vibration load, and the durability can be improved.

  The operation of the exhaust pipe on / off valve device 1 of this embodiment will be described.

  Usually, the actuator 5 is not operated, and the valve body 31 has the inner peripheral hole 2a fully opened. When the actuator 5 operates, air is supplied into the cylinder 511 and the piston 512 moves in the cylinder 511. When the piston 512 moves, the piston rod 513 moves and presses the joint 521. When the joint 521 is pressed, the clevis 522 rotates and the lever 523 rotates. When the lever 523 rotates, the rotating shaft member 32 rotates. As a result, the valve body 31 rotates in a direction to close the inner peripheral hole 2a. When the lever 523 rotates as it is, it contacts the stopper 43 on the axis 51c of the cylinder 511. At this time, the valve body 51 is preferably set so as to fully close the inner circumferential hole 2a.

As described above, the exhaust pipe on-off valve device 1 according to the present embodiment is provided in the middle of the exhaust pipe 10, and includes the valve housing 2 in which the inner peripheral hole 2 a constituting a part of the exhaust pipe 10 is formed, and the valve housing 2. A valve 3 supported so that the inner peripheral hole 2a can be opened and closed; and an actuator 5 that rotates the valve 3. The valve housing 2 is formed with a rotary shaft hole 2b that supports the valve 3 in the inner peripheral hole 2a. A bush 61 is inserted into the rotary shaft hole 2b, and the valve 3 is supported by the rotary shaft hole 2b through the bush 61 so as to be rotatable, and the rotary shaft member 32 is fixed to the rotary shaft member 32 and is connected to the inner peripheral hole 2a. Since the bush 61 is an expanded graphite braided gland packing,
It is possible to operate smoothly even under high temperature and corrosive environment.

  Further, according to the exhaust pipe on-off valve device 1 according to the present embodiment, the bush 61 and the rotary shaft member 32 are in surface contact, so that adhesion wear can be prevented, return failure can be prevented, and the operation is smoother. It becomes possible.

  In addition, according to the exhaust pipe opening / closing valve device 1 according to the present embodiment, the actuator 5 includes the stopper 43 that restricts the rotation of the rotary shaft member 32, and the actuator 5 includes the cylinder 51, the piston 512 that moves in the cylinder 511, and the piston A driving portion 51 including a piston rod 513 that supports 512, and a transmission portion 52 including a link-like lever 523 that transmits the driving force of the driving portion 51 to the rotary shaft member 32. Since the rotation of the rotary shaft member 32 is restricted by contacting the lever 523 on the axis 51c, the impact load of the stopper 43 transmitted to the bush 61 can be reduced to almost zero, and the bush 61 has an external force of exhaust pressure and vibration load. As a result, durability can be improved.

  Further, according to the exhaust pipe on-off valve device 1 according to the present embodiment, the actuator 5 includes the cylinder 51, the piston 512 that moves in the cylinder 511, the piston rod 513 that supports the piston 512, and one end of the cylinder 511. The end plate 515 includes an end plate 515 that covers the end plate 515. The end plate 515 contacts the piston 512 on the axis 51 c of the cylinder 51 to restrict the rotation of the rotary shaft member 32. The impact load of the end plate 515 can be made substantially zero, and the bush 61 receives only the external force of the exhaust pressure and the vibration load, so that the durability can be improved.

  Further, according to the exhaust pipe on-off valve device 1 according to the present embodiment, since the biasing member 66 that biases the lever 523 in the rotation axis direction is provided, a load is applied to the lever 523 and the play of the transmission portion 52 is removed. Therefore, it is possible to prevent wear due to fretting during vibration of the bush 61.

  Further, according to the exhaust pipe opening / closing valve device 1 according to the present embodiment, the pressing member 64 is provided between the bush 61 and the lever 523, and the labyrinth ring is provided inside the pressing member 64 and around the rotating shaft member 32. Since 65 is installed, shaft leakage can be prevented even if the bush 61 is partially worn.

  Although various embodiments of the present invention have been described, the present invention is not limited only to these embodiments, and the configurations of the respective embodiments and the configurations appropriately changed without departing from the scope of the invention. Embodiments having a configuration in which the configurations of the embodiments are appropriately combined also fall within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Exhaust pipe on-off valve apparatus 2 ... Valve housing 2a ... Inner peripheral hole 2b ... Rotating shaft hole 3 ... Valve 31 ... Valve body 32 ... Rotating shaft member 4 ... Bracket 4a ... Through-hole 5 ... Actuator 51 ... Drive part 511 ... Cylinder 512 ... Piston 513 ... Piston rod 52 ... Transmission portion 523 ... Lever 61 ... Bushing 62 ... Spacer 63 ... Cover 64 ... Pressing member 65 ... Labyrinth ring 66 ... Torsion coil spring (biasing member)

Claims (6)

A valve housing provided in the middle of the exhaust pipe and having an inner peripheral hole forming a part of the exhaust pipe;
A valve supported so as to be able to open and close the inner peripheral hole of the valve housing;
An actuator for rotating the valve;
With
The valve housing is
A rotation shaft hole for supporting the valve is formed in the inner peripheral hole,
A bush is inserted into the rotation shaft hole,
The valve is
A rotating shaft member rotatably supported by the rotating shaft hole via the bush;
A valve body fixed to the rotating shaft member to open and close the inner peripheral hole;
Have
The exhaust pipe opening / closing valve device, wherein the bush is an expanded graphite braided gland packing. The exhaust pipe on-off valve device according to claim 1, wherein the bush and the rotary shaft member are in surface contact. A stopper for restricting rotation of the rotary shaft member;
The actuator is
A drive unit including a cylinder, a piston that moves in the cylinder, and a piston rod that supports the piston;
A transmission unit including a link-shaped lever that transmits the driving force of the driving unit to the rotary shaft member;
Have
3. The exhaust pipe on-off valve device according to claim 1, wherein the stopper regulates rotation of the rotating shaft member by contacting the lever on an axis of the cylinder. The actuator is
A drive unit including a cylinder, a piston that moves in the cylinder, a piston rod that supports the piston, and an end plate that covers one end of the cylinder;
The exhaust pipe on-off valve device according to any one of claims 1 to 3, wherein the end plate regulates rotation of the rotary shaft member by contacting the piston on an axis of the cylinder. . The exhaust pipe on-off valve device according to any one of claims 1 to 4, further comprising an urging member that urges the lever in a rotation axis direction. A pressing member is provided between the bush and the lever,
The exhaust pipe on-off valve device according to any one of claims 1 to 5, wherein a labyrinth ring is installed inside the pressing member and around the rotating shaft member.

Images